Carlos,

>> (snip: Stored procedure to run a shell command

I'm glad you can't do this. Just replace your gfix command with 'format' or
something like that...

To create new users in Firebird use the API or access security database. You
can get some more info about this in Ivan Prenosil web site:

http://www.volny.cz/iprenosil/interbase/

Artur